fix wrong abs() call and modernize formatting

git-svn-id: http://zxing.googlecode.com/svn/trunk@2674 59b500cc-1b3d-0410-9834-0bbf25fbcc57
fix various wrong abs; other cleanup

git-svn-id: http://zxing.googlecode.com/svn/trunk@2675 59b500cc-1b3d-0410-9834-0bbf25fbcc57